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# Like cp $1 $2, but if the files are the same, do NOTHING.
# Status is 0 if $2 is changed, 1 otherwise.
if test -r "$2"; then
if cmp "$1" "$2" > /dev/null; then
echo "$2" is unchanged
else
cp -f "$1" "$2"
fi
else
cp "$1" "$2"
fi
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